package com.ganbo.ms.nio.group;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Scanner;

/**
 * @author ganbo
 * @date 2022/11/15 15:27
 */
public class GroupChantClient {

    //定义相关属性
    private final String HOST = "127.0.0.1";   //服务器ip
    private final int PORT = 6667;          //服务器端口
    private Selector selector;
    private SocketChannel socketChannel;
    private String username;

    //构造器，完成初始化工作
    public GroupChantClient() throws IOException {

        selector = Selector.open();
        //连接服务器
        socketChannel = SocketChannel.open(new InetSocketAddress(HOST, PORT));
        //设置非阻塞
        socketChannel.configureBlocking(false);
        //将channel注册到selector
        socketChannel.register(selector, SelectionKey.OP_READ);
        //得到username
        username = socketChannel.getLocalAddress().toString().substring(1);
    }

    //向服务器发送消息
    private void senInfo(String info) {
        info = username + " 说 " + info;

        try {
            socketChannel.write(ByteBuffer.wrap(info.getBytes()));
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    //读取从服务器端回复的消息
    public void readInfo() {
        try {
            int readChannels = selector.select(2000);
            if (readChannels > 0) { //有可用的通道(有事件发生的通道)
                Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
                while (iterator.hasNext()) {
                    SelectionKey key = iterator.next();
                    if (key.isReadable()) {
                        //得到相关的通道
                        SocketChannel sc = (SocketChannel) key.channel();
                        //得到一个Buffer
                        ByteBuffer buffer = ByteBuffer.allocate(1024);
                        sc.read(buffer);
                        //把缓冲区的数据转成字符串
                        String msg = new String(buffer.array());
                        System.out.println(msg.trim());
                    }

                    iterator.remove(); //删除当前的selectionKey防止重复操作
                }
            } else {
//                System.out.println("没有可用的通道");
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }


    public static void main(String[] args) throws IOException {
        GroupChantClient chantClient = new GroupChantClient();
        new Thread(() -> {
            while (true) {
                chantClient.readInfo();
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();


        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNextLine()) {
            String s = scanner.nextLine();
            System.out.println("s============>" + s);
            chantClient.senInfo(s);
        }
    }


}
